Evaporator.



No. 844,715. PATENTED FEB. 19, 1907.

A. A. DUNHAM. EVAPORATOR.

APPLIOATION FILED 0OT.14,1904.

UNITED STATES PATENT orrron.

ANDREW A. DUN HAM, OF ADAMS, NEW YORK, ASSIGNOR TO CASEIN COM- PANY OF AMERICA, A CORPORATION OF NEW JERSEY.

EVAPORATOH.

Specification of Letters Patent.

Application filed October 14,1904. Serial No. 228,442.

No. 844,715. I'atented Feb. 19, 1907.

To all It-7mm, it may concern: I the tank, and these feed-openings are pro- Be it known that I, ANDREW A. DUNIIAM, vided with adjustable gates 17, controlled by a citizen of the United States, residing at l regulating-screws 18, swiveled to said gates Adams, in the county of Jefferson and State and tapped in plates 19 at the top of the of New York, have invented certain new and tank, said screws being provided with heads useful Improvements in Evaporators, of i 20, by which they may be turned to adjust Wl11Cl1 the following is a specification, referthe said gates verticaly. The tank 14 is ence being had therein to the accompanying preferably provided with a coil or coils 21, drawings.

which may be connected either with a heat- This invention relates to that class of evaping medium, as a steam-supply, or with a reorators or drying-machinessuch, for examfrigerating-supply, so that the temperature ple, as is shown by United States Patent No. of the liquid in the tank may be controlled as 631,568in which two hollow steam-heated may be desirable for different purposes. The rollers or cylinders are arranged to receive the liquid to be evaporated is supplied to the liquid or semiliquid material to be evapotank through a pipe 23', provided with a rated and from which the dried material is hand-valve 24. The evaporating material is removed in thin films by stationary docremoved from the cylinders by stationa y tors or scrapers.

, doctors or scrapers 25, preferably adjustably The present invention relates more particconnected with the frame of the machine, in ularly to means by which the feed of the a well-known manner. The tank 14 is supliquid or semiliquid material to be evapoported on the frame of the machine by screwrated can be better controlled than heretorods 26, provided with hand-wheels 27, by fore, as will hereinafter appear.

which they may be turned to raise or lower In the accompanymg drawlngs, Figure 1 is the tank to any desired position. a side view of an evaporator embodying the In the use of this improvedmachine the present invention, and Fig. 2 is a partial sectank 14 will be adjusted to any desired positional view of the same.

tion,..so that the bottom board 15 of the tank Referring to the drawings, 12 denotes a Will have its edges in any desired degree of suitable frame in which are mounted two holproximity to the rotating drying-cylinders. low rotating rolls or cylinders 13 to be heated For some kinds of material a much more by steam in a well-known manner, these cyl- "rapid feed of the material to the drying-cylinders being driven, as usual, so as to rotate inders is desirable than with some other downward toward each other at their adjakinds of materials, and the adjustability 0f cent faces. In the machines of this class as the tank by which the space between the heretofore constructed the cylinders are aredges of the said bottom board and the surranged with their faces in contact, or practifaces of the cylinders may be varied is therecally so, with each other, and the material to fore important. Also in the evaporation of be evaporated is held in the pinch besome kinds of material it is sometimes detween the cylinders. For some uses, however, this is found to be objectionable in that the temperature of the liquid to be evaporated cannot be properly controlled nor can the feed of the material to the cylinders be properly regulated. In the present improved machine the material to be evapo; rated is held in a tank 14, which is adjustably sustained on the frame of the machine, so that the bottom board 15 of the tank may be located at any desired degree of proximity to the drying-cylinders, the sides of said bottom board adjacent to said cylinders being concaved or beveled to correspond to the contour of the cylinders, as shown in Fig. 2. Feed-openings 16 are provided at the sides of liquid to be evaporated held in the space afferded between the walls of the tank and the cylinders, and the quantity of material thus held in those spaces, as also the feed of the material to the-cylinders generally, can be regulated by raising or lowering the gates 17 by means of the screws 18. By the use ofa separate tank for holding the material to be evaporated and from which such material is fed to the cylinders a very considerable larger amount. of the surface of the dryingcylinders may be utilized for the purpose of evaporation than is possible when the material to .be evaporated is held in the pinch between contiguous cylinders, it being of sirable to have a considerable quantity of the inders much higher up than in the old conthe cylinders.

struction, and consequently with a resulting gain of considerable evaporating-surface on Also in the present improved construction the temperature of the liquid to be evaporated may be controlled by means of the heating or cooling coils, and if the said coils be heated to a high degree the liquid in the tank may be boiled and considerable evaporation thus carried on before the final evaporating operation on the cylinders.

Having thus described my invention, I claim and desire to secure by Letters Patent- 1. In an evaporating apparatus, the combination with two evaporating-cylinders arranged adjacent to but spaced apart from said cylinders.

2. 1n an evaporating apparatus, the cornbination with two evaporating-cylinders arranged ad acent to but spaced apart from each other, of a separate supply-tank arranged between said cylinders and from which the material to be evaporated is fed to the cylinders, said supply-tank being provided with means for varying or regulating the temperature of the material held therein.

In testimony whereof I affix my signature in presence of two witnesses.

I ANDREW A. DUNHAM.

Witnesses:

HENRY CALVER, A. O. CUsHMAN. 

